PTC thermistors as limit temperature sensors
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1 PTC thermistors as limit temperature sensors Series/Type: B59300 Date: January 2016 EPCOS AG Reproduction, publication and dissemination of this publication, enclosures hereto and the information contained therein without EPCOS' prior express consent is prohibited. EPCOS AG is a TDK Group Company.
2 Applications Thermal protection of winding in electric motors Limit temperature monitoring Features Thermistor pellets with insulating encapsulation in series connection (triple sensor) Low-resistance type, steep R/T curve Silver-plated and PTFE-insulated AWG 26 litz wires Characteristics for sensing temperatures Tsense = 90 up to 160 C conform with DIN Color coding of litz wires to DIN 44082, connecting wires in yellow UL approval to UL 1434 (file number E69802) RoHS-compatible Dimensional drawing Dimensions in mm Delivery mode Bulk General technical data Max. operating voltage (T A = C) V max 30 V DC Measuring voltage 1) (T A = 25 C... T sense +5 K) V meas 2.5 V DC Max. measuring voltage 1) For T A see table "Electrical V meas,max 7.5 V DC specifications" Rated resistance (V PTC 2.5 V) R R 300 Ω Insulating test voltage Acc. to DIN V ins 2.5 kv AC Thermal threshold time Acc. to DIN t a < 3 s Operating temperature range (V V meas,max ) T op 25/ T sense +23 C Operating temperature range (V = V max ) T op 0/+40 C 1) V meas and V meas,max for 90 C T sense 160 C acc. to DIN Page 2 of 12
3 Electrical specifications and ordering codes T sense C T = ±5 K R (T sense T) (V PTC 2.5 V) Ω R (T sense + T) (VPTC 2.5 V) Ω R (T sense + 15 K) (V PTC 7.5 V) Ω R (T sense + 23 K) (V PTC 7.5 V) Ω Ordering code k - B59300M1100A k - B59300M1110A k - B59300M1120A k - B59300M1130A k - B59300M1140A k - B59300M1150A k - B59300M1155A k - B59300M1160A070 T = ±7 K k B59300M1180A070 Color coding of litz wires (to DIN 44082) T sense C Color 100 red/red 110 brown/brown 120 grey/grey 130 blue/blue 140 white/blue 150 black/black 155 blue/black 160 blue/red 180 white/red Page 3 of 12
4 Reliability data Test Standard Test conditions R 25 /R 25 Electrical endurance, constant IEC Storage at V max and T op,max (@ V max ) Test duration: 1000 h Damp heat IEC Temperature of air: 40 C Relative humidity of air: 93% Duration: 56 days Test according to IEC Rapid change of temperature IEC T 1 = T op,min (0 V), T 2 = T op,max (0 V) Number of cycles: 100 Test duration: 30 min Test according to IEC , test Na Vibration IEC Frequency range: 10 to 55 Hz Displacement amplitude: 0.75 mm Test duration: 3 2 h Test according to IEC , test Fc < 25% < 10% < 25% < 5% Page 4 of 12
5 Characteristics (typical) PTC resistance R PTC versus PTC temperature T PTC (measured at low signal voltage) Page 5 of 12
6 Characteristics (typical) PTC resistance R PTC versus PTC temperature T PTC (measured at low signal voltage) Page 6 of 12
7 Cautions and warnings General EPCOS thermistors are designed for specific applications and should not be used for purposes not identified in our specifications, application notes and data books unless otherwise agreed with EPCOS during the design-in-phase. Ensure suitability of thermistor through reliability testing during the design-in phase. The thermistors should be evaluated taking into consideration worst-case conditions. Storage Store thermistors only in original packaging. Do not open the package prior to processing. Storage conditions in original packaging: storage temperature 25 C C, relative humidity 75% annual mean, maximum 95%, dew precipitation is inadmissible. Avoid contamination of thermistors surface during storage, handling and processing. Avoid storage of thermistor in harmful environment with effect on function on long-term operation (examples given under operation precautions). Use thermistor within the following period after delivery: Through-hole devices (housed and leaded PTCs): 24 months Motor protection sensors, glass-encapsulated sensors and probe assemblies: 24 months Telecom pair and quattro protectors (TPP, TQP): 24 months Leadless PTC thermistors for pressure contacting: 12 months Leadless PTC thermistors for soldering: 6 months SMDs in EIA sizes 3225 and 4032, and for PTCs with metal tags: 24 months SMDs in EIA sizes 1210 and smaller: 12 months Handling PTCs must not be dropped. Chip-offs must not be caused during handling of PTCs. The ceramic and metallization of the components must not be touched with bare hands. Gloves are recommended. Avoid contamination of thermistor surface during handling. Soldering (where applicable) Use rosin-type flux or non-activated flux. Insufficient preheating may cause ceramic cracks. Rapid cooling by dipping in solvent is not recommended. Complete removal of flux is recommended. Standard PTC heaters are not suitable for soldering. Page 7 of 12
8 Mounting Electrode must not be scratched before/during/after the mounting process. Contacts and housing used for assembly with thermistor have to be clean before mounting. Especially grease or oil must be removed. When PTC thermistors are encapsulated with sealing material, the precautions given in chapter "Mounting instructions", "Sealing and potting" must be observed. When the thermistor is mounted, there must not be any foreign body between the electrode of the thermistor and the clamping contact. The minimum force and pressure of the clamping contacts pressing against the PTC must be 10 N and 50 kpa, respectively. In case the assembly is exposed to mechanical shock and/ or vibration this force should be higher in order to avoid movement of the PTC during operation. During operation, the thermistor s surface temperature can be very high. Ensure that adjacent components are placed at a sufficient distance from the thermistor to allow for proper cooling at the thermistors. Ensure that adjacent materials are designed for operation at temperatures comparable to the surface temperature of thermistor. Be sure that surrounding parts and materials can withstand this temperature. Avoid contamination of thermistor surface during processing. Operation Use thermistors only within the specified temperature operating range. Use thermistors only within the specified voltage and current ranges. Environmental conditions must not harm the thermistors. Use thermistors only in normal atmospheric conditions. Avoid use in deoxidizing gases (chlorine gas, hydrogen sulfide gas, ammonia gas, sulfuric acid gas etc), corrosive agents, humid or salty conditions. Contact with any liquids and solvents should be prevented. Be sure to provide an appropriate fail-safe function to prevent secondary product damage caused by abnormal function (e.g. use VDR for limitation of overvoltage condition). This listing does not claim to be complete, but merely reflects the experience of EPCOS AG. Display of ordering codes for EPCOS products The ordering code for one and the same EPCOS product can be represented differently in data sheets, data books, other publications, on the EPCOS website, or in order-related documents such as shipping notes, order confirmations and product labels. The varying representations of the ordering codes are due to different processes employed and do not affect the specifications of the respective products. Detailed information can be found on the Internet under Page 8 of 12
9 Symbols and terms Symbol Term A Area C Capacitance C th f I I max I R I res I PTC I r I r,oil I r,air I RMS I S I Smax LCT N N c N f P Heat capacity Frequency Current Maximum current Rated current Residual current PTC current Residual currrent Residual currrent in oil (for level sensors) Residual currrent in air (for level sensors) Root-mean-square value of current Switching current Maximum switching current Lower category temperature Number (integer) Operating cycles at V max, charging of capacitor Switching cycles at V max, failure mode Power P 25 Maximum power at 25 C P el P diss R G R min Electrical power Dissipation power Generator internal resistance Minimum resistance R R Rated rated temperature T R R R Tolerance of R R Parallel resistance R P R PTC R ref R S PTC resistance Reference resistance Series resistance R 25 Resistance at 25 C R 25,match Resistance matching per reel/ packing unit at 25 C R 25 Tolerance of R 25 Page 9 of 12
10 T t T A t a T C t E T R T sense T op T PTC t R T ref T Rmin t S T surf UCT V or V el V c(max) V F,max V RMS V BD V ins V link,max V max V max,dyn V meas V meas,max V R V PTC α δ th τ th λ Temperature Time Ambient temperature Thermal threshold time Ferroelectric Curie temperature Settling time (for level sensors) Rated 25 C or otherwise specified in the data sheet Sensing temperature Operating temperature PTC temperature Response time Reference temperature Temperature at minimum resistance Switching time Surface temperature Upper category temperature Voltage (with subscript only for distinction from volume) Maximum DC charge voltage of the surge generator Maximum voltage applied at fault conditions in protection mode Root-mean-square value of voltage Breakdown voltage Insulation test voltage Maximum link voltage Maximum operating voltage Maximum dynamic (short-time) operating voltage Measuring voltage Maximum measuring voltage Rated voltage Voltage drop across a PTC thermistor Temperature coefficient Tolerance, change Dissipation factor Thermal cooling time constant Failure rate Lead spacing (in mm) Page 10 of 12
11 Important notes The following applies to all products named in this publication: 1. Some parts of this publication contain statements about the suitability of our products for certain areas of application. These statements are based on our knowledge of typical requirements that are often placed on our products in the areas of application concerned. We nevertheless expressly point out that such statements cannot be regarded as binding statements about the suitability of our products for a particular customer application. As a rule, EPCOS is either unfamiliar with individual customer applications or less familiar with them than the customers themselves. For these reasons, it is always ultimately incumbent on the customer to check and decide whether an EPCOS product with the properties described in the product specification is suitable for use in a particular customer application. 2. We also point out that in individual cases, a malfunction of electronic components or failure before the end of their usual service life cannot be completely ruled out in the current state of the art, even if they are operated as specified. In customer applications requiring a very high level of operational safety and especially in customer applications in which the malfunction or failure of an electronic component could endanger human life or health (e.g. in accident prevention or lifesaving systems), it must therefore be ensured by means of suitable design of the customer application or other action taken by the customer (e.g. installation of protective circuitry or redundancy) that no injury or damage is sustained by third parties in the event of malfunction or failure of an electronic component. 3. The warnings, cautions and product-specific notes must be observed. 4. In order to satisfy certain technical requirements, some of the products described in this publication may contain substances subject to restrictions in certain jurisdictions (e.g. because they are classed as hazardous). Useful information on this will be found in our Material Data Sheets on the Internet ( Should you have any more detailed questions, please contact our sales offices. 5. We constantly strive to improve our products. Consequently, the products described in this publication may change from time to time. The same is true of the corresponding product specifications. Please check therefore to what extent product descriptions and specifications contained in this publication are still applicable before or when you place an order. We also reserve the right to discontinue production and delivery of products. Consequently, we cannot guarantee that all products named in this publication will always be available. The aforementioned does not apply in the case of individual agreements deviating from the foregoing for customer-specific products. 6. Unless otherwise agreed in individual contracts, all orders are subject to the current version of the "General Terms of Delivery for Products and Services in the Electrical Industry" published by the German Electrical and Electronics Industry Association (ZVEI). Page 11 of 12
12 Important notes 7. The trade names EPCOS, Alu-X, CeraDiode, CeraLink, CeraPad, CeraPlas, CSMP, CSSP, CTVS, DeltaCap, DigiSiMic, DSSP, ExoCore, FilterCap, FormFit, LeaXield, MiniBlue, MiniCell, MKD, MKK, MotorCap, PCC, PhaseCap, PhaseCube, PhaseMod, PhiCap, PQSine, SIFERRIT, SIFI, SIKOREL, SilverCap, SIMDAD, SiMic, SIMID, SineFormer, SIOV, SIP5D, SIP5K, TFAP, ThermoFuse, WindCap are trademarks registered or pending in Europe and in other countries. Further information will be found on the Internet at Page 12 of 12
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